java分页之假分页

假分页，顾名思义，不是真正的在数据库里进行过滤，而是从数据库查询之后，取得全部结果，在展现的时候做些手脚。

import java.util.ArrayList;
import java.util.List;

public class Pager {

    /**
     * 当前页码
     */
    private int currentPage;
    /**
     * 总页数
     */
    private int totalPage;
    /**
     * 总行数
     */
    private int totalRows;
    /**
     * 每页显示条数
     */
    private int avgRows = 5;
    /**
     * 原集合
     */
    private List list;

    public Pager() {
        super();
    }

    public Pager(int currentPage, int avgRows, List list) {
        super();
        this.currentPage = currentPage;
        this.avgRows = avgRows;
        this.list = list;
        this.totalRows = list.size();
        this.totalPage = (this.totalRows - 1) / this.avgRows + 1;
    }

    public List getPagerList() {
        List newList = new ArrayList();
        for(int i = (currentPage - 1) * avgRows; i < totalRows && i < currentPage * avgRows; i++) {
            newList.add(list.get(i));
        }
        return newList;
    }

    public int getCurrentPage() {
        return currentPage;
    }
    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }
    public int getTotalPage() {
        return totalPage;
    }
    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }
    public int getAvgRows() {
        return avgRows;
    }
    public void setAvgRows(int avgRows) {
        this.avgRows = avgRows;
    }

    public int getTotalRows() {
        return totalRows;
    }

    public void setTotalRows(int totalRows) {
        this.totalRows = totalRows;
    }

    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }

}

这是一个简单的分页器，原理很简单，将从数据库查询的数据，传入到分页器里，返回的是分好页的集合。 

这种方法不适用于大批量数据。

原文地址：http://www.cnblogs.com/ghsau/archive/2012/02/08/2768571.html